Two parallel disks having equal diameters of 30 cm are maintained at 120C and 34C. The disks

Question:

Two parallel disks having equal diameters of 30 cm are maintained at 120ºC and 34ºC. The disks are spaced a distance of 80 cm apart, on centers, and immersed in a conducting medium having k = 3.4 W/m· ºC. Assuming that the disks exchange heat only on the sides facing each other, calculate the heat lost by the hotter disk, expressed in watts.